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6814437: G1: remove the _new_refs array

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The per-worker _new_refs array is used to hold references that point into the collection set. It is populated during RSet updating and subsequently processed. In the event of an evacuation failure it processed again to recreate the RSets of regions in the collection set. Remove the per-worker _new_refs array by processing the references directly. Use a DirtyCardQueue to hold the cards containing the references so that the RSets of regions in the collection set can be recreated when handling an evacuation failure.

Reviewed-by: iveresov, jmasa, tonyp
This commit is contained in:
John Cuthbertson 2010-08-02 12:51:43 -07:00
parent 75c23332be
commit 3a2b2b4fd8
14 changed files with 407 additions and 180 deletions
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21
hotspot/src/share/vm/gc_implementation/g1/dirtyCardQueue.hpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2001, 2009, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -123,7 +123,21 @@ public:
int stop_at = 0,
bool during_pause = false);
bool apply_closure_to_completed_buffer_helper(int worker_i,
// If there exists some completed buffer, pop it, then apply the
// specified closure to all its elements, nulling out those elements
// processed. If all elements are processed, returns "true". If no
// completed buffers exist, returns false. If a completed buffer exists,
// but is only partially completed before a "yield" happens, the
// partially completed buffer (with its processed elements set to NULL)
// is returned to the completed buffer set, and this call returns false.
bool apply_closure_to_completed_buffer(CardTableEntryClosure* cl,
int worker_i = 0,
int stop_at = 0,
bool during_pause = false);
// Helper routine for the above.
bool apply_closure_to_completed_buffer_helper(CardTableEntryClosure* cl,
int worker_i,
BufferNode* nd);
BufferNode* get_completed_buffer(int stop_at);
@ -136,6 +150,9 @@ public:
return &_shared_dirty_card_queue;
}
// Deallocate any completed log buffers
void clear();
// If a full collection is happening, reset partial logs, and ignore
// completed ones: the full collection will make them all irrelevant.
void abandon_logs();